12k$ that seems pretty reasonable for basically a new car. I guess how much money he can get out of the carcass depends on how much effort he puts into parting out the individual pieces.
It amazes me that used cells like your old ones are selling for more than $100 on ebay. https://www.ebay.com/itm/232064782260?h ... SwvzRXxQrD
So if I'm thinking right, y'all will gross more than $4800 just from selling the old cells.